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      02-09-2022, 11:11 AM   #3073
Adrian g.
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Drives: German
Join Date: Nov 2011
Location: Dallas, TX

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Quote:
Originally Posted by dogbone View Post
Quote:
Originally Posted by roastbeef View Post
what causes the voltphreaks to take a higher voltage at startup? weakening battery? also, why is the higher voltage at startup bad? is it bad for the car?
I am not knowledgeable on this topic, but my understanding is that if the battery loses charge, it will pull more voltage from the alternator. Making the alternator work hard I guess is not ideal. I'll invite someone with more knowledge on this topic to enlighten us.
Had the same or similar issue with my Antigravity battery. Car would pull up to 15v after start up only, and set off lights/messages in the idrive.

Replaced the voltage regulator, no change. Replace the alternator with a new one which also included a voltage regulator, no change. Reinstalled the OEM battery, and it never happened again.
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